| 1 | /* $Id: messagerefentry.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Program usage and help formatting.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "internal/iprt.h"
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| 32 | #include <iprt/message.h>
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| 33 |
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| 34 | #include <iprt/env.h>
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| 35 | #include <iprt/errcore.h>
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| 36 | #include <iprt/path.h>
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| 37 | #include <iprt/string.h>
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| 38 | #include <iprt/stream.h>
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| 39 | #include "internal/process.h"
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| 40 |
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| 41 |
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| 42 | /*********************************************************************************************************************************
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| 43 | * Global Variables *
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| 44 | *********************************************************************************************************************************/
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| 45 | /** Spaces for intending. */
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| 46 | static const char g_szSpaces[] = " ";
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| 47 |
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| 48 |
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| 49 | /**
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| 50 | * Retruns the width for the given handle.
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| 51 | *
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| 52 | * @returns Screen width.
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| 53 | * @param pStrm The stream, g_pStdErr or g_pStdOut.
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| 54 | */
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| 55 | static uint32_t getScreenWidth(PRTSTREAM pStrm)
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| 56 | {
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| 57 | static uint32_t s_acch[2] = { 0, 0 };
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| 58 | uint32_t iWhich = pStrm == g_pStdErr ? 1 : 0;
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| 59 | uint32_t cch = s_acch[iWhich];
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| 60 | if (cch)
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| 61 | return cch;
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| 62 |
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| 63 | const char *psz = RTEnvGet("IPRT_SCREEN_WIDTH");
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| 64 | if ( !psz
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| 65 | || RTStrToUInt32Full(psz, 0, &cch) != VINF_SUCCESS
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| 66 | || cch == 0)
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| 67 | {
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| 68 | int rc = RTStrmQueryTerminalWidth(pStrm, &cch);
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| 69 | if (rc == VERR_INVALID_FUNCTION)
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| 70 | {
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| 71 | /* It's not a console, but in case we're being piped to less/more/list
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| 72 | we look for a console handle on the other standard output handle
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| 73 | and standard input. (Latter doesn't work on windows.) */
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| 74 | rc = RTStrmQueryTerminalWidth(pStrm == g_pStdErr ? g_pStdOut : g_pStdErr, &cch);
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| 75 | if (rc == VERR_INVALID_FUNCTION || rc == VERR_INVALID_HANDLE)
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| 76 | rc = RTStrmQueryTerminalWidth(g_pStdIn, &cch);
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| 77 | if (RT_FAILURE(rc))
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| 78 | cch = 80;
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| 79 | }
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| 80 | }
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| 81 |
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| 82 | s_acch[iWhich] = cch;
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| 83 | return cch;
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| 84 | }
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| 85 |
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| 86 |
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| 87 | /**
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| 88 | * Prints a string table string (paragraph), performing non-breaking-space
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| 89 | * replacement and wrapping.
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| 90 | *
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| 91 | * @returns IRPT status code.
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| 92 | * @param pStrm The output stream.
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| 93 | * @param psz The string table string to print.
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| 94 | * @param cchMaxWidth The maximum output width.
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| 95 | * @param fFlags String flags that may affect formatting.
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| 96 | * @param pcLinesWritten Pointer to variable to update with written lines.
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| 97 | */
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| 98 | static int printString(PRTSTREAM pStrm, const char *psz, uint32_t cchMaxWidth, uint64_t fFlags, uint32_t *pcLinesWritten)
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| 99 | {
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| 100 | uint32_t cLinesWritten;
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| 101 | size_t cch = strlen(psz);
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| 102 | const char *pszNbsp = strchr(psz, RTMSGREFENTRY_NBSP);
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| 103 | int rc;
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| 104 |
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| 105 | /*
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| 106 | * No-wrap case is simpler, so handle that separately.
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| 107 | */
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| 108 | if (cch <= cchMaxWidth)
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| 109 | {
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| 110 | if (!pszNbsp)
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| 111 | rc = RTStrmWrite(pStrm, psz, cch);
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| 112 | else
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| 113 | {
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| 114 | do
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| 115 | {
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| 116 | rc = RTStrmWrite(pStrm, psz, pszNbsp - psz);
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| 117 | if (RT_SUCCESS(rc))
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| 118 | rc = RTStrmPutCh(pStrm, ' ');
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| 119 | psz = pszNbsp + 1;
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| 120 | pszNbsp = strchr(psz, RTMSGREFENTRY_NBSP);
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| 121 | } while (pszNbsp && RT_SUCCESS(rc));
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| 122 | if (RT_SUCCESS(rc))
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| 123 | rc = RTStrmWrite(pStrm, psz, strlen(psz));
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| 124 | }
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| 125 | if (RT_SUCCESS(rc))
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| 126 | rc = RTStrmPutCh(pStrm, '\n');
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| 127 | cLinesWritten = 1;
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| 128 | }
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| 129 | /*
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| 130 | * We need to wrap stuff, too bad.
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| 131 | */
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| 132 | else
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| 133 | {
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| 134 | /* Figure the paragraph indent level first. */
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| 135 | uint32_t cchIndent = 0;
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| 136 | while (*psz == ' ')
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| 137 | cchIndent++, psz++;
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| 138 | Assert(cchIndent + 4 + 1 <= RT_ELEMENTS(g_szSpaces));
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| 139 |
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| 140 | if (cchIndent + 8 >= cchMaxWidth)
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| 141 | cchMaxWidth += cchIndent + 8;
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| 142 |
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| 143 | /* Work our way thru the string, line by line. */
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| 144 | uint32_t cchHangingIndent = 0;
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| 145 | cLinesWritten = 0;
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| 146 | do
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| 147 | {
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| 148 | rc = RTStrmWrite(pStrm, g_szSpaces, cchIndent + cchHangingIndent);
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| 149 | if (RT_FAILURE(rc))
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| 150 | break;
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| 151 |
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| 152 | size_t offLine = cchIndent + cchHangingIndent;
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| 153 | bool fPendingSpace = false;
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| 154 | do
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| 155 | {
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| 156 | const char *pszSpace = strchr(psz, ' ');
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| 157 | size_t cchWord = pszSpace ? pszSpace - psz : strlen(psz);
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| 158 | if ( offLine + cchWord + fPendingSpace > cchMaxWidth
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| 159 | && offLine != cchIndent
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| 160 | && fPendingSpace /* don't stop before first word */)
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| 161 | break;
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| 162 |
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| 163 | pszNbsp = (const char *)memchr(psz, RTMSGREFENTRY_NBSP, cchWord);
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| 164 | while (pszNbsp)
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| 165 | {
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| 166 | size_t cchSubWord = pszNbsp - psz;
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| 167 | if (fPendingSpace)
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| 168 | {
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| 169 | rc = RTStrmPutCh(pStrm, ' ');
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| 170 | if (RT_FAILURE(rc))
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| 171 | break;
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| 172 | }
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| 173 | rc = RTStrmWrite(pStrm, psz, cchSubWord);
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| 174 | if (RT_FAILURE(rc))
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| 175 | break;
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| 176 | offLine += cchSubWord + fPendingSpace;
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| 177 | psz += cchSubWord + 1;
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| 178 | cchWord -= cchSubWord + 1;
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| 179 | pszNbsp = (const char *)memchr(psz, RTMSGREFENTRY_NBSP, cchWord);
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| 180 | fPendingSpace = true;
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| 181 | }
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| 182 | if (RT_FAILURE(rc))
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| 183 | break;
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| 184 |
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| 185 | if (fPendingSpace)
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| 186 | {
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| 187 | rc = RTStrmPutCh(pStrm, ' ');
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| 188 | if (RT_FAILURE(rc))
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| 189 | break;
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| 190 | }
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| 191 | rc = RTStrmWrite(pStrm, psz, cchWord);
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| 192 | if (RT_FAILURE(rc))
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| 193 | break;
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| 194 |
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| 195 | offLine += cchWord + fPendingSpace;
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| 196 | psz = pszSpace ? pszSpace + 1 : strchr(psz, '\0');
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| 197 | fPendingSpace = true;
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| 198 | } while (offLine < cchMaxWidth && *psz != '\0' && RT_SUCCESS(rc));
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| 199 |
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| 200 | if (RT_SUCCESS(rc))
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| 201 | rc = RTStrmPutCh(pStrm, '\n');
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| 202 | if (RT_FAILURE(rc))
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| 203 | break;
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| 204 | cLinesWritten++;
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| 205 |
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| 206 | /* Set up hanging indent if relevant. */
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| 207 | if (fFlags & RTMSGREFENTRYSTR_FLAGS_SYNOPSIS)
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| 208 | cchHangingIndent = 4;
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| 209 | } while (*psz != '\0');
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| 210 | }
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| 211 | *pcLinesWritten += cLinesWritten;
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| 212 | return rc;
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| 213 | }
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| 214 |
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| 215 |
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| 216 | /**
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| 217 | * Checks if the given string is empty (only spaces).
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| 218 | * @returns true if empty, false if not.
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| 219 | * @param psz The string to examine.
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| 220 | */
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| 221 | DECLINLINE(bool) isEmptyString(const char *psz)
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| 222 | {
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| 223 | char ch;
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| 224 | while ((ch = *psz) == ' ')
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| 225 | psz++;
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| 226 | return ch == '\0';
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| 227 | }
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| 228 |
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| 229 |
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| 230 | /**
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| 231 | * Prints a string table.
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| 232 | *
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| 233 | * @returns Current number of pending blank lines.
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| 234 | * @param pStrm The output stream.
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| 235 | * @param pStrTab The string table.
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| 236 | * @param fScope The selection scope.
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| 237 | * @param pcPendingBlankLines In: Pending blank lines from previous string
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| 238 | * table. Out: Pending blank lines.
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| 239 | * @param pcLinesWritten Pointer to variable that should be incremented
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| 240 | * by the number of lines written. Optional.
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| 241 | */
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| 242 | RTDECL(int) RTMsgRefEntryPrintStringTable(PRTSTREAM pStrm, PCRTMSGREFENTRYSTRTAB pStrTab, uint64_t fScope,
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| 243 | uint32_t *pcPendingBlankLines, uint32_t *pcLinesWritten)
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| 244 | {
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| 245 | uint32_t cPendingBlankLines = pcPendingBlankLines ? *pcPendingBlankLines : 0;
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| 246 | uint32_t cLinesWritten = 0;
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| 247 | uint32_t cchWidth = getScreenWidth(pStrm) - 1; /* (Seems a -1 here is prudent, at least on windows.) */
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| 248 | uint64_t fPrevScope = fScope;
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| 249 | int rc = VINF_SUCCESS;
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| 250 | for (uint32_t i = 0; i < pStrTab->cStrings; i++)
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| 251 | {
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| 252 | uint64_t fCurScope = pStrTab->paStrings[i].fScope;
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| 253 | if ((fCurScope & RTMSGREFENTRYSTR_SCOPE_MASK) == RTMSGREFENTRYSTR_SCOPE_SAME)
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| 254 | {
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| 255 | fCurScope &= ~RTMSGREFENTRYSTR_SCOPE_MASK;
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| 256 | fCurScope |= (fPrevScope & RTMSGREFENTRYSTR_SCOPE_MASK);
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| 257 | }
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| 258 | if (fCurScope & RTMSGREFENTRYSTR_SCOPE_MASK & fScope)
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| 259 | {
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| 260 | const char *psz = pStrTab->paStrings[i].psz;
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| 261 | if (psz && !isEmptyString(psz))
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| 262 | {
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| 263 | while (cPendingBlankLines > 0 && RT_SUCCESS(rc))
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| 264 | {
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| 265 | cPendingBlankLines--;
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| 266 | rc = RTStrmPutCh(pStrm, '\n');
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| 267 | cLinesWritten++;
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| 268 | }
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| 269 | if (RT_SUCCESS(rc))
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| 270 | rc = printString(pStrm, psz, cchWidth, fCurScope & RTMSGREFENTRYSTR_FLAGS_MASK, &cLinesWritten);
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| 271 | if (RT_FAILURE(rc))
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| 272 | break;
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| 273 | }
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| 274 | else
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| 275 | cPendingBlankLines++;
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| 276 | }
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| 277 | fPrevScope = fCurScope;
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| 278 | }
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| 279 |
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| 280 | if (pcLinesWritten)
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| 281 | *pcLinesWritten += cLinesWritten;
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| 282 | if (pcPendingBlankLines)
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| 283 | *pcPendingBlankLines = cPendingBlankLines;
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| 284 | return rc;
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| 285 | }
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| 286 |
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| 287 |
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| 288 | RTDECL(int) RTMsgRefEntrySynopsisEx(PRTSTREAM pStrm, PCRTMSGREFENTRY pEntry, uint64_t fScope, uint32_t fFlags)
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| 289 | {
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| 290 | AssertReturn(!(fFlags & ~RTMSGREFENTRY_SYNOPSIS_F_USAGE), VERR_INVALID_FLAGS);
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| 291 |
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| 292 | if (!pStrm)
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| 293 | pStrm = g_pStdOut;
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| 294 | int rc = VINF_SUCCESS;
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| 295 | if (fFlags & RTMSGREFENTRY_SYNOPSIS_F_USAGE)
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| 296 | RTStrmPutStr(pStrm, "Usage: ");
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| 297 | if (RT_SUCCESS(rc))
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| 298 | rc = RTMsgRefEntryPrintStringTable(pStrm, &pEntry->Synopsis, fScope, NULL, NULL);
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| 299 | return rc;
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| 300 | }
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| 301 |
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| 302 |
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| 303 | RTDECL(int) RTMsgRefEntrySynopsis(PRTSTREAM pStrm, PCRTMSGREFENTRY pEntry)
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| 304 | {
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| 305 | return RTMsgRefEntrySynopsisEx(pStrm, pEntry, UINT64_MAX, true /*fPrintUsage*/);
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| 306 | }
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| 307 |
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| 308 |
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| 309 | RTDECL(int) RTMsgRefEntryHelpEx(PRTSTREAM pStrm, PCRTMSGREFENTRY pEntry, uint64_t fScope, uint32_t fFlags)
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| 310 | {
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| 311 | AssertReturn(!fFlags, VERR_INVALID_FLAGS);
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| 312 | if (!pStrm)
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| 313 | pStrm = g_pStdOut;
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| 314 | return RTMsgRefEntryPrintStringTable(pStrm, &pEntry->Help, fScope, NULL, NULL);
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| 315 | }
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| 316 |
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| 317 |
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| 318 | RTDECL(int) RTMsgRefEntryHelp(PRTSTREAM pStrm, PCRTMSGREFENTRY pEntry)
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| 319 | {
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| 320 | return RTMsgRefEntryHelpEx(pStrm, pEntry, UINT64_MAX, 0 /*fFlags*/);
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| 321 | }
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| 322 |
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